php教程数据查询部分
php教程数据查询部分语法代码：
<?php
class MyPDO{
...
//判断匹配的类型
private function fetchType($type){
switch ($type){
case 'num':
return PDO::FETCH_NUM;
case 'both':
return PDO::FETCH_BOTH;
case 'obj':
return PDO::FETCH_OBJ;
default:
return PDO::FETCH_ASSOC;
}
}
//获取所有数据 ，返回二维数组
public function fetchAll($sql,$type='assoc'){
try{
$stmt=$this->pdo->query($sql);//获取PDOStatement对象
$type= $this->fetchType($type); //获取匹配方法
return $stmt->fetchAll($type);
} catch (Exception $ex) {
$this->showException($ex, $sql);
}
}
//获取一维数组
public function fetchRow($sql,$type='assoc'){
try{
$stmt=$this->pdo->query($sql);//获取PDOStatement对象
$type= $this->fetchType($type); //获取匹配方法
return $stmt->fetch($type);
} catch (Exception $ex) {
$this->showException($ex, $sql);
exit;
}
}
//返回一行一列
public function fetchColumn($sql){
try{
$stmt=$this->pdo->query($sql);
return $stmt->fetchColumn();
} catch (Exception $ex) {
$this->showException($ex, $sql);
exit;
}
}
}
//测试
$param=array(
);
$mypdo= MyPDO::getInstance($param);
//echo $mypdo->exec('delete from news where id=6');
/*
if($mypdo->exec("insert into news values (null,'11','1111',unix_timestamp())"))
echo '自动增长的编号是：'.$mypdo->lastInsertId ();
*/
//$list=$mypdo->fetchAll('select * from news');
//$list=$mypdo->fetchRow('select * from news where id=1');
$list=$mypdo->fetchColumn('select count(*) from news');
echo '<pre>';
var_dump($list);
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